Abstract: In view of the gas leak in pipeline,especially,the sulfured hydrogen-containing gas pipeline leak will greatly threaten the nearby environment,the numerical simulation is carried out about the sulfured hydrogen-containing gas pipeline leak and diffusion on flat areas.The simulation indicates that under the condition of static wind,when gas diffusion gets stale in air,its pressure,speed and the distribution of concentration are basically symmetric.The concentration of sulfured hydrogen is quite high at the zones near the jet hole,above the jet hole and near ground,they are danger zones.When wind blows and the scope of diffusion gets larger,wind will play the role of lightening diffusion,the effectiveness will increase as height increases.While without wind,the jetting area is located above the leaking hole,and jetting area comes to deform when wind is blowing.As wind speed increases,the danger area decreases in size.Simulating the law of gas pipeline leaking point diffusion can provide reference to safe production and emergency response.

Key words: leak and diffusion, sulfured hydrogen, numerical simulation, danger zone, FLUENT